On the old standalone versions of Vivecraft where it used an installer, the climb claws applied velocity when you pushed your player off walls. This feature does not appear to be present on the fabric mod.

Doesn't work on fabric mod.
Feature worked on the standalone mod (https://github.com/jrbudda/Vivecraft_118).
other note: the models also don't appear to have the magenta tint applied either.

I just checked, doesn't work there either, are you sure you didn't use the jumpboots walljump?

maybe, right now you can do it with the jump boots

Ok, I checked too and that was a very strong Mandela effect. I could have sworn on my life that I remembered making little parkour challenges where you flung yourself with the climb claws but apparently not. Do you think you could add it as a feature request though? It would be cool for navigation!

magenta tint isn't there becasue of issues with sodium, but we did add a new item model, which will be in the next version.
I don'T think ther was ever a inertial with climbing, but I can double check.
if you mean the combination with the jumpboots that should work